Construct the matrix diagram for each of the following models. drug diffusion: a drug taken orally eventually diffuses into the bloodstream through the stomach. let st be the amount of drug in the stomach at the times t and bt the amount that has been absorbed into the bloodsteam. each time step, 50% of the drug is absorbed from the stomach into the bloodstream and 80% of the drug in the blood stream is metabolized. we have st+1= 0.9st, bt+1=0.5st+0.2bt